INA780A datasheet(13/51 Pages) TI1

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Temperature ( C)

-50

-25

100

125

150

400

450

500

550

600

650

700

750

Figure 6-1. IS+ to IS– Package Resistance vs Temperature

The internal compensation of the INA780x corrects for pin-to-pin resistance increases with temperature,

achieving low drift over the ambient temperature range.

The INA780x is most accurate when measuring currents around 30 A. As currents increase, the error in the

current measurement also increases. Figure 6-2 shows how the gain error of the INA780x varies with the shunt

current for all device options.

Shunt Current (A)

-100

-50

100

150

200

250

300

350

400

Figure 6-2. Gain Error vs Shunt Current

The shape of this curve will vary some based on the PCB design. Designs with better thermal performance will

generally flatten this curve.

The temperature coefficient of the shunt is compensated by sampling the junction temperature and internally

applying a correction factor based on this temperature to the reported current measurements. During transient

currents, the shunt heats faster than the temperature sensor. This temporary difference in temperatures results

in higher values in the reported current until the temperature stabilizes. Figure 6-3 shows the sampled output

response during a current step from 0A to 45 A

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INA780A, INA780B

SBOSAB6A – JULY 2023 – REVISED DECEMBER 2023

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